Silicate insulating material



Examiner 106. COMPOSITIONS, l

COATING 0R PLASTIC.

Dec. 14, 1937. H. M. WILLIAMS SILICATE INSULATING MATERIAL Filed March30, 1929 3 Sheets-Sheet 1 106. COMPOSITIONS,

COATING 0R PLASTIC.

Dec. 14, 1937.

H. M. WILLIAMS SILICATE INSULATING MATERIAL Filed March .'50, 1929LXElmm@ 3 Sheets-Sheet 2 j ucnfot Examine COM POSITIONS COATING 0RPLASTIC.

Dec. 14, 1937.

H. M. WILLIAMS SILICATE INSULATING MATERIAL Filed March 30, 1929 3Sheets-Sheet 3 mmm grs/vanto@ 07%, f/I/m au, fg/LMM Mu YM mi MH 106.COMPOSITIUNS,

pime on PLASTIC.

Patented Dec. 14, 1937 UNITED STATES PATENT OFFICE Application nach so,1929, serial No. 351,364

IClaim.

This invention relates to refrigerating apparatus and more particularlyto a cabinet for use with mechanical refrigerating systems.

An object of this invention is to provide a gapiget with a new tyge ofinsulation.

Further objects a van ages of the present invention will be apparentfrom the following description, reference being had to the accompanyingdrawings. wherein a preferred form of the 1 present invention is clearlyshown.

In the drawings:

Fig. l is a vertical transverse cross-sectional view of a cabinetembodying features of this invention;

Fig. 2 is a vertical cross-sectional view of the cabinet taken at rightangles to Fig. 1;

Fig. 3 is a horizontal cross-sectional view of the cabinet taken alongthe line 3-3 of Fig. l;

Fig. 4 is a view in perspective, with parts broken away, of theinsulation which may be used in the cabinet; and

Fig. 5 is an enlarged cross-section of the insulation.

A cabinet embodying features of this invention may comprise in general aframework generally designated as 2U, a food compartment generallydesignated as 2l, insulation, generally designated as 22, and an outercasing generally designated as 23.

a0 The framework may be of any suitable construction. In one embodimentthe framework may include vertical rear corner angle irons and verticalfront corner angle irons 26. It also may include upper horizontal sideangle irons 2l,

$6 upper corner front angle irons 28, upper rear corner angle irons 29.The framework may also include lower horizontal angle irons designatedas 21a, 28a, and 29a which correspond respectively to the upper cornerangle irons 21 to 29 inclusive.

40 Also, if desired, the framework may include intermediate side angleirons 2lb, intermediate front angle irons 28h, and rear intermediateangle irons 29h corresponding to similarly numbered upper horizontalangle irons, angle iron 2lb having its angle upwardly turned to receivethe door jamb. All of these angle irons may be suitably joined at theirintersections, for instance by spotwelding, and, if necessary, gussets30 may be provided-at some or all of the corners in order to 50reenforce the structure. I'he framework may also include a relativelynon-conducting door jamb 3| which, if desired, may include upper andlower horizontal members 32, vertical side members 3,3 and, ifnecessary, a center mullion 3l.

55 These members may be made of wood, or other (Cl. 10G-19)non-conducting substance, and may have their intersections morticed inany suitable manner. 'I'he door jamb may be secured to the framework,for instance, by inserting it within the angles of some of the angleirons and by securing it in place by means of screws or the like.

The food compartment 2| may be of any suitable character. For instanceit may be a boxlike sheet metal structure having an offset 36 along theedge of the opening. The edge 31 may be secured to the door jamb 32 byany suitable means such as by nails or the like, not shown. Finishingstrips 38 may be placed over the edge 31 as well as over the edge ofsome of the outer panels hereinafter to be more fully described. u Thecompartment 2| may be porcelain enamel nish if desired.

The insulation 22 may be of any suitable construction preferablycomprising a layer Ill of a porous baked material hereinafter to be more20 fully described. This baked material may be attached to the foodcompartment with lining, if so desired, and an embodiment for doing thisis by placing bituminous cement Il on the food compartment 2| or on theporous baked material, 25 or on both. While the bituminous cement isstill in the molten condition, the porous baked material is applied tothe lining, which is thus secured to the lining when the cement coolsand hardens.

If desired, an outer layer of bituminous cement 30 42 may also beapplied to the porous baked material. 'I'hus the porous baked materialis conistance the panel structure may be substantially 40 as disclosedin the copending application of Henry P. Braeutigam and William C.Holbrook, Serial No. 257,989, tiled February 28, 1928, to whichreference is made, if necessary, for a further disclosure. If desired,cushioning pads 43 45 of cardboard, wall-board or the like may beinterposed between the framework and the outer panels. This isparticularly desirable when the outer panels are porcelain enameled, toprevent breakage of the enamel.

Suitable doors 4I are hinged to the cabinet and, for instance, may beattached to the vertical corner angle irons 26 or to the door jambmember 33 by suitable hinges and screws. If a lower compartment 50 isprovided for the reception of ma- 55 chinery or the like a door 5| mayalso be provided and may be hinged at 52. The machinery may rest on ametal panel 53 resting on the lower horizontal frame members.

I'he porous baked material 40 preferably contains silicate of sodium andsome metal reenforcement. The reenforcement may be wire mh 60 preferablyapplied near both edges of the blocks 6I which are in a convenient shapefor l application to the food compartment. The sol erably a hot diumsilicate is preferably mixed with water,

preferably not over 50% of water, and is EaEed in suitable ovens attemperatures generally ranging between l000 and l100 F. The oven isprefear ottom urner of gas or oil suitable to maintain a temperature of1000 F. to 1100 F. The mixture of silicate and water is placed insuitable pans and placed in the oven for the necessary length of timewhich causes the mixture to puiI and harden into a porous baked mass. Ithas been found that when sodium silicate has its ratio of SiO;` to NazOincreased, the solubility of the baked product is decreased. Thus whenthe ratio of SiO: to NazO is 2 to l the resulting product is moresoluble than the ratio is 3.25 to 1. Also the insolubility may befurther increased by adding some substance,

preferably intermixed with the sodium silicate. A substance which hasbeen found suitable is 'num sul hate. For instance, the addition 0% 72%of aluminum sulphate increases the insolubility somewhat. Also ammoniumchloride (8%) further increases the so u lity.

ture of 5 pounds of sodium silicate 5% oz. of zinc oxide and 1200 cc. ofwat-er Has are added, at least of all constituents other than water inthe insulation is sodium silicate. Thus it has been found that blocks ofthe porous baked material when made as insoluble as possible, whenreenforced by HARRYMWIILIAMS.

also given good resi-lits. Thus, when water-proong substances metal andwhen cov-

